Determina: Cos 23°
Cos(60°-37°) = Cos 60° . Cos 37° + Sen 60° . Sen 37°
Cos(60°-37°) = Cos 60° . Cos 37° + Sen 60° . Sen 37°
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Respuesta:
Cos 23°=Cos(60°-37°) = Cos 60° . Cos 37° +Sen 60° . Sen 37°
=1/2(4/5)+√3/2(3/5)
=2/5+3√3/10
=(4+3√3)/10